GB2093956A

GB2093956A - Shut off and regulating valve

Info

Publication number: GB2093956A
Application number: GB8205601A
Authority: GB
Original assignee: Friedrich Grohe Armaturenfabrik GmbH and Co
Current assignee: Grohe Water Technology AG and Co KG
Priority date: 1981-02-27
Filing date: 1982-02-25
Publication date: 1982-09-08
Also published as: IT8219818A0; DE3107431A1; IT1149670B; FR2500902A1; DK84482A

Abstract

A shut off and regulating valve has a valve seat disc (6) sealed in the housing. On valve seat disc (6), on the upstream side is fitted a valve regulating disc (7), rotatable to blank off one or more passages in valve seat disc (6). For delicate rotation of valve regulating disc (7) there is non- rotatably mounted in housing (2) a positioning element (4) which is axially displaceable by rotation of valve stem (3), being connected to valve regulating disc (7) by means of a rotary element (5), wherein rotary element (5) is rotationally fast with valve regulating disc (7) and is coupled to positioning element (4) by means of thread (8). Rotation of stem (3) causes axial movement of element (4) and rotation, at a slower speed, of elements (5) and valve disc (7). <IMAGE>

Description

SPECIFICATION Shut off and regulating valve The invention concerns a shut off and regulating valve with the features detailed in the preamble of claim 1. A valve of this type is described in US patent specification 2.923.318.

With these valves it is frequently regarded as a disadvantage that the setting movement of the handle from closed position to fully open position only requires a quarter of a turn of the handle. On account of this short setting travel or setting angle fine adjustment of the required rate of flow is difficult. In addition the valve can by virtue of the small setting angle be moved suddenly from fully open position to closed position which can lead to undesirable water hammer in the supply line.

In addition the principle is known in the case of a valve (DE-GM 77 26 941) with a valve regulating disc rotatable in relation to a fixed valve seat of interposing a wheel gear between the valve stem and the handle so that flow regulation can be effected by means of several turns of the handle. With these valves however it is necessary to locate the valve elements separately in a specially designed pipe fitting housing and to provide the valve with a handle of special design.

The purpose of the invention is to provide by simple means a delicately adjustable shut off and regulating valve which can be used in conventional pipe fittings and with normal handles. The purpose is also to design the valve such that it can also be used subsequently with pipe fittings already installed which had originally been equipped with a standard valve top with axially slideable obturating elements.

This problem is solved by the invention by the features specified in the characteristic section of claim 1. Other designs of the invention are detailed in claims 2 to 5.

These measures in accordance with the invention have the effect that the angle of rotation of the handle from closed to open position can be increased many times whereby in addition the valve can be fitted in a housing which has the external dimensions of a standard valve top with axially sliding obturating element and in addition can be used subsequently in already installed pipe fittings after removal of the conventional valve top.

The drawing shows design examples of the invention, being described in detail below.

Figure 1 shows a longitudinal section through a shut off and regulating valve inserted in a pipe fitting; Figure 2 shows a longitudinal section through another shut off and regulating valve; Figure 3 shows a side view of the positioning element as per Figure 2.

For the sake of simplicity identical or corresponding elements have been given the same reference numbers in the two drawings illustrating the design examples. The valve shown in Figure 1 is retained in a partially shown pipe fitting 1 by screw thread. All the valve elements are located in a housing 2 of rotationally symmetrical design whereby the external dimensions of the housing are the same as the dimensions of standard valve tops with axially sliding valve discs. Coaxially in housing 2 is mounted a rotatable valve stem 3 which is axially fixed and sealed. The inside end section is provided with a fine or standard thread and is joined to a positioning element 4. Positioning element 4 is retained in housing 2 in a hexagonal guide so as to be prevented from rotating but free to slide axially.In the section of housing 2 located inside pipe fitting 1, at right angles to the longitudinal axis, a valve seat disc 6 is retained so as to be sealed and prevented from rotating in housing 2. On the upstream side of valve seat disc 6 is interposed a valve regulating disc 7, being retained in this position with a leaf spring 21. The valve seat disc 6 has one or more passages which can be closed or opened successively up to full cross sectional area by rotation with one or more openings of the valve regulating disc or by means of a suitably shaped cylindrical surface of valve regulating disc 7. On the downstream end face between valve seat disc 6 and the end face of valve stem 3 is coaxially mounted a rotary element 5. Rotary element 5 engages with a pin 51 through a central hole in valve seat disc 6 into valve regulating disc 7 so as to prevent rotation.

At the opposite end section rotary element 5 is joined to positioning element 4 by means of a drive thread 8.

The valve operates in the following manner: the medium flows in the direction of the arrow out of pipe fitting 1 in the region of a section taking for example the form of valve seat 11 for a conventional valve with an axially sliding obturating element into housing 2 open on its end face and forces valve regulating disc 7 into closed position against valve seat disc 6. If now valve spindle 3 is turned with a handle, thread 31 produces axial displacement of positioning element 4 which by means of drive thread 8 rotates rotary element 5 and valve regulating disc 7 joined to it, and according to the degree of rotation exposes the passage in valve seat disc 6 so that the medium can be discharged radially through two holes 22 provided in the wall of housing 2 into an outlet passage of pipe fitting 1.

By suitable choice of the pitch of thread 31 the transmission ratio can be varied over a relatively wide range whereby however drive thread 8 does not have to be designed so as to be self-locking.

Figures 2 and 3 show another design example of the invention whereby instead of a drive thread, rotary element 5 is provided with a transverse pin 9 whose two end sections engage in helical grooves 41 of positioning element 4.

As a result of axial displacement of the nonrotationally guided positioning element 4 the transverse pin 9 together with rotary element 5 and the appropriate valve regulating disc 7 are rotated. The helical grooves 41 are designed in such a way that self-locking is prevented. By suitable choice of the pitch of thread 31 the transmission ratio can also be varied over a wide range. In order to minimize the frictional forces in the grooves, transverse pin 9 is fitted with rollers 91 which are preferably conical in shape, these locating in suitably shaped grooves 41.

Otherwise the two design examples are of identical construction and possess the same flow characteristics. To ensure positive sealing of housing 2 in the pipe fitting, a seal ring 23 is.

provided in each case on housing 2 on the one hand at the screw in thread 12 of pipe fitting 1 and on the other hand on the end face of valve seat 11. Valve seat disc 6 and valve regulating disc 7 are preferably made of a wear resistant material such as for example carbide metal, oxide ceramic etc.

Claims

1. A shut off and regulating valve for sanitary pipe fittings, comprising a housing having axial inlet and radial outlet openings and insertable in a pipe fitting, a valve seat disc at right angles to the longitudinal axis and provided with at least one passage and retained so as to prevent rotation, a valve regulating disc resting on the seat disc and rotatable by means of a valve stem mounted in the housing, characterized by the fact that in the housing (2) is fitted a positioning element (4) which is mounted so as not to rotate but to axially slide and is joined by means of a rotary element (5) to the valve regulating disc (7), wherein the rotary element (5) is rotationally fast with the valve regulating disc and is coupled to the positioning element (4) by means of one or more non-self-locking helical surfaces (8).

2. Shut off and regulating valve in accordance with claim 1 characterized by the fact that the rotary element (5) is mounted coaxially with the positioning element (4) and is secured axially by valve seat disc (6) and/or the non-rising valve stem (3).

3. Shut off and regulating valve in accordance with claims 1 and 2 characterized by the fact that the positioning element (4) is coupled to the rotary element (5) by means of a drive thread (8).

4. Shut off and regulating valve in accordance with claims 1 and 2 characterized by the fact that the rotary element (5) is coupled with a transverse pin (9) to positioning element (4) whereby the transverse pin (9) engages in helical grooves (41) in positioning element (4).

5. Shut off and regulating valve in accordance with claim 4 characterized by the fact that in the area of grooves (41) there are rollers (91) preferably taper rollers fitted on transverse pin (9) whereby the grooves (41) have suitably shaped rolling faces.

6. Shut off and regulating valve substantially as hereinbefore described with reference to and as illustrated in Figure 1, or Figures 2 and 3 of the accompanying drawings.